On 07/25/2012 03:33 PM, Olivier Blin wrote:
---
clients/gears.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/clients/gears.c b/clients/gears.c
index 70ec86c..8e7d4df 100644
--- a/clients/gears.c
+++ b/clients/gears.c
@@ -59,6 +59,8 @@ struct gears {
GLint gear_list[3];
int fullscreen;
+ int frames;
+ struct timespec last_fps;
};
struct gear_template {
@@ -203,10 +205,37 @@ make_gear(const struct gear_template *t)
}
static void
+update_fps(struct gears *gears)
+{
+ struct timespec now;
+ long diff_ms;
+
+ gears->frames++;
+
+ clock_gettime(CLOCK_MONOTONIC, &now);
+
+ diff_ms = (now.tv_sec - gears->last_fps.tv_sec) * 1000 +
+ (now.tv_nsec - gears->last_fps.tv_nsec) / 1000000;
You should just pass the timestamp of the frame callback instead of
using clock_gettime().
Cheers,
Ander
+
+ if (diff_ms > 5000) {
+ float seconds = diff_ms / 1000.0;
+ float fps = gears->frames / seconds;
+
+ printf("%d frames in %6.3f seconds = %6.3f FPS\n",
gears->frames, seconds, fps);
+ fflush(stdout);
+
+ gears->frames = 0;
+ gears->last_fps = now;
+ }
+}
+
+static void
frame_callback(void *data, struct wl_callback *callback, uint32_t time)
{
struct gears *gears = data;
+ update_fps(gears);
+
gears->angle = (GLfloat) (time % 8192) * 360 / 8192.0;
window_schedule_redraw(gears->window);
@@ -407,6 +436,8 @@ gears_create(struct display *display)
gears->view.rotx = 20.0;
gears->view.roty = 30.0;
+ clock_gettime(CLOCK_MONOTONIC, &gears->last_fps);
+
glEnable(GL_NORMALIZE);
glMatrixMode(GL_PROJECTION);
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